1-苯基-3-甲基-4-三氟乙酰基吡唑酮-(5)与中性磷萃取剂对La(Ⅲ)的协同萃取

SYNERGISTIC EXTRACTION OF LANTHANUM(III) WITH 1-PHENYL-3-METHYL-4-TRIFLUOROACETYL-PYRAZOL-ONE-5 AND NEUTRAL ORGANOPHOSPHORUS COMPOUNDS

1-苯基-3-甲基-4-三氟乙酰基吡唑酮-(5)(以下简作PMTFP,在反应式中用HA代表)系4-酰基吡唑酮-(5)类螯合萃取剂,这类萃取剂是Jensen于1959年首先提出的,1963年国内就开始将这类萃取剂应用于镧系元素的萃取和放射化学的分离分析中.国外自1965年以来也做了大量工作,迄今已用于50多个元素的萃取.实践证明,这是一类优良的萃取剂.4-酰基吡唑酮-(5)类萃取剂与中性磷类萃取剂的协萃体系也已开展了一些工作.其中以1-苯基-3-甲基-4-苯甲酰基吡唑酮-(5)

The extraction of lanthanum (III) from perchloric acid solutions into mixtures of 1-phenyl-3-methyl-4-trifluoroacetyl-pyrazol-one-5 (PMTFP) and a neutral organophosphorus extractant, e. g. tri-n-butylphosphate(TBP)or tri-n-octylphosphinoxide (TOPO), in benzene has been studied.The formulae of the extracted species have been shown te be LaA_(?).S and LaA_(?).2S (where HA=PMTFP, S=TBP, TOPO), and their equilibrium constants calculated. The equilibrium constants have been found to be greater for such mixtures than the either component alone.